This article, written in 1903 in the Proceedings of the American Philological Association, discusses the history of the auxiliary verb in the German language.
This 19 page essay by Keyes outlines what he considers to be the best way to teach students to read moderately difficult German in the second year of instruction.
This commencement speech was originally given by Dr. Charles Reuben Keyes to the Student Body of Cornell College in the Senior Chapel on May 29, 1941. The text was read by Rev. Richard Thomas at Cornell's anniversary convocation on March 30, 1978.…